Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
DIGITAL SENSING CIRCUIT FOR A SECONDARY CLOCK SIGNAL TO BE MONITORED FOR CLOCK FAILURE WITH THE AID OF A PRIMARY CLOCK SIGNAL
Document Type and Number:
WIPO Patent Application WO/2013/185960
Kind Code:
A3
Abstract:
The invention relates to a digital sensing circuit (100) for a secondary clock signal (204) to be monitored for clock failure with the aid of a primary clock signal (202), comprising a flip-flop (102) which has a clock input (108), a data input (106), a Q output (110) and a reset input (112), and further comprising an n-bit counter (104) which has a clock input (114), a reset input (128) and a counter reading output (116). The digital sensing circuit according to the invention should avoid meta-stable states being reached and also detect multiple state changes of the secondary clock signal (204) within a cycle time and thus be suitable for operating safety-relevant assemblies, which can also be used in nuclear power plants. For this purpose, the flip-flop (102) and the n-bit counter (104) are wired electrically to each other, wherein n ≥ 2, the primary clock signal (202) is present on the clock input (114) of the n-bit counter (104), the secondary clock signal (204) is present on the clock input (108) of the flip-flop (102), a constant signal is present on the data input (106) of the flip-flop (102), the Q output (110) of the flip-flop (102) is connected to the reset input (128) of the n-bit counter (104), and the counter reading output (116) of the n-bit counter (104) is connected to the reset input (112) of the flip-flop (102) via an interposed logic gate (122).

Inventors:
AUER, Günther (Artilleriestr. 21a, Erlangen, 91052, DE)
HEINEMANN, Bernd (Friedrich-Bauer-Str. 4a, Erlangen, 91058, DE)
Application Number:
EP2013/058168
Publication Date:
February 20, 2014
Filing Date:
April 19, 2013
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
AREVA GMBH (Paul-Gossen-Strasse 100, Erlangen, 91052, DE)
International Classes:
H03K21/08; H03K21/40
Domestic Patent References:
WO2007110099A12007-10-04
Foreign References:
US5479420A1995-12-26
US20050242852A12005-11-03
Attorney, Agent or Firm:
KUGLER, Jörg (Tergau & Walkenhorst, Patentanwälte RechtsanwälteEschersheimer Landstrasse 105-107, Frankfurt am Main, 60322, DE)
Download PDF: